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Overview
Introduction
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- The SA380TX can monitor 1 x Bender
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- type IRDH265 / 365 insulation monitor.
- In addition to the isometer, volt-free contact outputs from Bender fault-repeater devices (such as the ESD-470) may also be connected the SA380TX general purpose digital inputs.
- If a 4-20mA output converters such as the RK170 is utilised, this can be connected to the SA380TX general purpose analogue inputs, although RS485 connection is preferred.
- Other models of Bender isometer may be supported over RS485 - check the Bender documentation to see if the RS485 protocol matches
- Please be aware that 1 x
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- SA380TX can only monitor 1 x Bender Isometer. This is a limitation of the Bender protocol, not the SA380TX.
Data Available
| Parameter | Units | RS485 | 4-20mA | Digital VFC | Notes |
|---|---|---|---|---|---|
| Instantaneous Resistance to Earth |
Present Alert Levels
| k Ohm | This is the last reading of Resistance-to-Earth taken by the isometer | ||||
| Alert Levels | k Ohm | The isometer permits two configurable alert thresholds. These levels are both reported | |||
| Alarm Status | Digital | Reports if either alarm level has been breached | |||
| Fault Repeat Relay Status |
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| Digital | Reports if output fault relay has been energised. Essentially mirrors alarm status | |||
| Connection Error | Digital |
AC Fault
DC+ Fault
DC- Fault
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| Set to UP or TRUE is not RS485 data has been received from the isometer for 7 minutes. | |||||
| AC, DC+, DC- Fault | Digital | For DC Systems, Indicates which leg is experiencing the worst fault. For AC systems, only the AC flag will be asserted. | |||
| Fault Repeater Output | Digital | Where a fault repeater is provided and a single isometer monitors a multiple-feeder arrangement, a digital volt-free-contact output is provided for each feeder. The feeder experiencing the worst fault will have its contact closed. |
These parameters can be continuously monitored to perform long-term trend analysis of cable condition, to alert maintainers of faults that require intervention, and to aid diagnosis of the fault type and location.
Wiring
RS485
typical rs485 stuff
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